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R, FRIEDEL. I OVAL GRINDING MACHINE. NO. 445,169. Patented Jan. 27, 1891.

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R. FRIEDEL. OVAL GRINDING MACHINE.

No. 445,169. Patented Jan;Z7,1891.

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R. FRIEDEL. OVAL GRINDING MACHINE. No. 445,169. Patented Jan. 27,1891.

777/ lllllllllljllllllllllllllll' V lllllllfi llh a lUNTTnn STATEs PATENT Orrrca ROBERT FRIlEDEL, OF UT GA t", GERMANY, ASSIGNOR- TO TIIE STUTT- GART-FURTHER HOLZ & SPIEGELMANUFACTUR, OF SAME PLACE.

OVAL-GRINDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 415,169, dated January 27', 1891.

Application filed May 20,1889. Serial No. 311.495.

(N model.) Patented in England April 29, 1889 No. 7,136, in France April 29, 1889, No. 197,824; in Germany April 30, 1889, No. 49,820; in Belgium November 11, 1889. N0- SSAlO; in Austria- Hungary anuary 28, 1890, 40 441, and in Italy January 30, 1890, No. 27,608.

To aZZ whom it may concern:

Be it known that I, ROBERT FRIEDEL, a subject of the Emperor of Germany, residing at Stuttgart, in Germany, have invented a certain new and useful Improvement in Oval Grindingltlachines, (for which I have obtained Letters Patent in Germany, No.19,820, dated April 30, 1889; in Great Britain, No. 7,136, dated April 29, 1889; in Belgium, No. 88,4:10, dated November 1 1,1889 inAustria-I'lungary, ed/aihdated Jan ua-ry23, 1890; in France,No. 197,82t, dated April 29,1889, and in Italy, No. 27,608, dated January 80,1890;) and I do here by declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to machines forgrinding glass, the, to an oval shape; and it consists in certain combinations of parts, as hereinafter described and claimed.

Reference being made to the annexed drawings, Figure 1 is a front elevation of the improved machine. Fig. 2 is a side elet'ation thereof. Fig. 2 is a perspective view of the machine. Fig. 3 is a plan View of the grinding-disk and swing-frame supporting the same. Fig. at is sectional view of the chuck. Fig. 5 is a perspective view of the chuck. Figs. 6, 7,8, and 9 are detail views thereof. Figs. 10 to are further detail views of the chuck.

On the upper part of the pillar or frame F are guided the two slides S and S on opposite sides and capable of being adjusted in a vertical direction by the screws V and V. The slide 8 carries at its upper end the table 1, cast obliquely therewith and provided with the socket B for the oval-chuck O, hereinafter described. 011 the slide S is the bracket T, forked at the top and adjustable horizontally on the bracket S by the screw V This bracket T serves for supporting the'swingframe G, carrying the grinding-disk 8'. On the shaft to, journaled in the fork of the bracket T, are the two three-grade pulleys K and K, two driving-belt pulleys 'r and r one of which is fast and the other one loose,

and the swing-fra1ne G. The latter, which can swing upon the shaft it, carries at its front ends two adjustable wooden bearings, between which lies the shaft It", provided with points and carrying the grade-pulley K which corresponds with the pulley K on the shaft It and also the grinding-disk S". The lowest point of the disk S" is the grindingpoint and lies in a vertical plane with the center of the column F.

On the side of the column F of the machine is arranged a lever device. The lever 11 turns on a pivot P, which is fixed to the column F. The rod II, supporting the outer end of the swing-frame G, is straight below and provided with round holes and connected with the lever 11' by the pin Q. The lever-II carries in frontthe sliding weight G. The whole lever contrivance keeps the swing-frame G in a horizontally-balanced position. By suitably moving the weight G the pressure with which the glass is ground can be regulated.

On the left of the machine is bolted or otherwise fastened an angle-bracket U, which serves for supporting the clamp E of the oval-chucl:. The anglebracket N, arranged on the front of the machine, carries at its forward end a vertical set-screw M in the same vertical plane with the lever 11.

The driving of the shaft to is done by a belt connecting the shafting to the fast pulley 0:. An ordinary disengaging-fork may be employed to move the belt R from the fast pulley r to the loose pulley r and thus the working of the machine can be stopped at once. The driving of the grinding-disk and of the oval-chuck is performed from the shaft to. For the first the grade-pulley K on the shaft w is connected by a belt with the pulley K on the shaftw. For the other the grade-pulley K on the shaft It is geared by belt to the pulley K on the shaft 202. The raising and lowering device of the slide S, with the bracket T, the horizontal adjustment of the bracket T, the vertical adjustment of the bracket S, carrying the oval chuck, render possible, first, that in any case the grinding-point may be at the lowest point of the grinding-disk, and, second, glass disks can be beveled more or less obliquely and to greater or less Width.

The improved machine has a further advantage that ovals of different.- sizes and of different proportion of axes can be made by reason of the construction of the oval-chuck. The hopper z is intended for supplying sand or emery and water, and, the position of the glass plate being always oblique in grinding, produces and accelerates a natural escape of the water and of the sand. Duringthe grinding the grinding-disk is lowered gradually, and thereby effects a slow raising of the le- Ver H. When the latter has arrived against the screw M, the glass has been completely ground. By pressing down the lever H until the projecting spring F stops it the swingframe G is raised, so that the clamp E, Fig. 4:. with the glass plate, can be easily removed or inserted.

The following is a description of the ovalchuck: On the slide S are cast in oblique position the socket B and the quadrangular frame or table t, Fig. 2, on the two sides of which are the bearings for the shaft 10 The socket B is perpendicular to the table t, being in one piece therewith and with the bracket S. The socket B, Fig. 4, supports a mandrel a, which can rotate freely therein. On the upper half of this mandrel is arranged a pinion 2, into which gears a worm p on the shaft 10 To the upper end of the mandrel n is firmly secured a plate a, which has a recess crossing its center. through which a slide '11 can be moved to and fro. On the under face of this slide are arranged in diametrically-opposite positions and parallel to one another two short bars '0 and c so that the slide forms a sort of sledge. This sledge carries above a conical pin a, with a tapered nose. The clamp E carries in the part a a corresponding recess with which it fits exactly on the conical pin. This allows of easy removal or fixing of the clamp. Direct on the tablet is the part A, Fig. 4:, which is adjustable to and fro by the screw S and a guide at the table. Said part terminates at its front end in a hollow ring m. This hollow ring is touched from without by the runners 'u and o of the sledge v at two points situated diametrically opposite to one another. Upon the rotation of the mandrel n with the sledge the runners are compolled to slide around the hollow ring, whereby the sledge i receives a twofold motion:

First, it rotates at the same speed as the mandrel, and, secondly, it is alternately drawn to and fro across the axis of the mandrel. The motion is therefore according to mathematical rules, such that a true ellipse is ground out. The clamp E consists, principally, of two iron rods 0 and b, which can be screwed together by screws 1; and 7c. The lower rod 0 terminates in front with a ring which contains the part a, which is placed upon the conical pin of the sledge o. The part a carries on its upper surface two pivots to receive the iron plates covered with gum,-upon which the glass to be ground is to be placed. The clamp rests upon the angle-bracket a, Fig. 1, which is fastened to the main column F.

The screw S serves for altering the proportion of the greater and lesser axis (axis eccentricity) of the ellipse. To grind circular glasses the mandrel n is replaced by a mandrel upon which the clamp E can be placed direct.

I claim- 1. In an oval-grinding machine, an oval chuck comprising a rotary mandrel, a crossslotted plate u thereon, a frame 41, guided in said slot and adapted to be reciprocated therein, a pin a on said frame 4), and a clamp E for attachment of the object to be ground on said frame '12, substantially as set forth.

2. The combination, substantially as set forth, with a support F, of a vertically-adj ustable slide S thereon, an obliquely-set ovalchuck on said slide, a vertically-adjustable slide S on said support, a horizontally-adj ustable bracket T on said latter slide, a swingframe G, pivoted to said bracket, and a rotary grinding-disk supported by said swing-frame.

3. The combination, with a support F, of an adjustable slide S thereon, a rotary chuck on said slide, a clamp Eon said chuck, an adjustable slide S on said support, a horizontally-adjustable bracket T on said slide S, a swing-frame G, hinged on said bracket, a rotary grinding-disk S in said swing-frame, rod H, lever H, and adjustable abutment M for said lever H, the whole substantially as and for the purpose set forth.

In testimony whereof I have si ned this specification in the presence of two subscribing witnesses.

ROBERT FRIEDEL.

\Vitnesses:

RICHARD HETTLER, THEODORE ABENHEIM. 

